Electronic – Disc-Shaped Component with two contacts

One thing you could try is to attempt an advanced Google search.

I searched for "IAM E3318" with quotes to look for the exact phrase. The third result (this post being the first) was http://www.computerhistory.org/collections/catalog/102711348

Unfortunately it didn't help with a part number, but the manufacturer states Intel Corporation. Exactly how much this can be trusted, I cannot say, but it might give you more information to refine your search.

You could also try and add things like 16 (number of pins) or DIP (if you know the package).

Alternatively you can search for the 'main part' ie a motherboard, or whatever the assembly where you're mystery component is on. You never know, you might find a BOM or schematic. (try searching for that part number but only for PDFs e.g. 'NE555 filetype:pdf')

Hope that helps

It looks to me like the wiring on the PCB matches the chip pinout that you show — why do you say that it does not?

In any case, ADXL345 is the part number of the chip itself, which is made by Analog Devices; get the datasheet from them.

It doesn't seem as though there's any documentation on the PCB itself, so it looks like you'll have to assume that the signal labels on its pads correspond to the pins with the same names on the chip. You may need to do some reverse-engineering to figure out exacly what all of the other parts they've added are doing. It looks like there's a 3-terminal regulator and some bypass capacitors on the left, and some pullup/pulldown/termination resistors and an LED for various signals on the right. This is why you should never buy a board that has no documentation.